Becareful of trying to even out pH ... Each whole number away from 7 is 10x more powerful acid/base. it is not a linear scale, it is logrithmic. But, yes, add a bit more acidic irrigation/fertigation to try to bring the pH down.
I think this is partly a result of a poor ratio of nutes fed over a long period of time. Your plant has looked rough from the start -- possibly the soil? possibly your fertilization methods? not enough infor to know.
if you've been giving water-only and getting runoff for any period of time, good chance you've reduced concentration in the soil. Use a different ratio of nutes going forward. start with a 1-1-2 with 'hydro/soilless' nutes or 2-1-2 ratio with soil nutes